Housing for a dental prophylaxis unit



FIG. 1 is a top plan view of a housing for a dental prophylaxis unit showing my new design;

FIG. 2 is a front end elevational view thereof;

FIG. 3 is a rear end elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a housing for a dental prophylaxis unit, as shown. 